I've been planning to deal with this for some time. I'd looked for an off-the-shelf solution but couldn't find one. Finally last weekend I bit the bullet and did something about it.
The rat's next of wires and power supplies behind my entertainment system was a tangled mess. Cleaning the floor was almost impossible. It was unacceptable.
First I organized the wires, consolidated those that I could tie together, and attached them and the power supplies to the wall.
Then I built a 4 sided box to slip over the mess and hide it. I would have liked to have consolidated more wires so there were only 2 or three bundles going into the box, but they weren't long enough. I was able to tuck the wires up into the box so they aren't on the floor so I can vacuum under them.